Make RPCTimeout for udp_send_recv_dgram to be 500 milliseconds.
Make RPCTimeout for udp_send_recv_dgram to be 500 milliseconds.

The test will sometimes fail on Bind calls using the old RPCTimeout.

PiperOrigin-RevId: 356646668

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor